Make a VM crash more obvious.

dart/tools/utils.py

Index: dart/tools/utils.py
diff --git a/dart/tools/utils.py b/dart/tools/utils.py
index 8f4a83ea90e9c47925a4d495d5e42013458020ca..0a3feba592bd7e46db2c7cac962c62729feffde5 100644
--- a/dart/tools/utils.py
+++ b/dart/tools/utils.py
@@ -264,6 +264,19 @@ class ToolError(Exception):
     return repr(self.value)
 
 
+def IsCrashExitCode(exit_code):
+  if IsWindows():
+    return 0x80000000 & exit_code

[Emily Fortuna, 2012/03/22 20:40:48]

where's the x8000000 coming from?

[ahe, 2012/03/22 20:46:32]

I don't know. All I know is that this is in test.py that is running on all the
V8 build bots and it seems to work. See
http://code.google.com/p/v8/source/browse/branches/bleeding_edge/tools/test.p...

[Emily Fortuna, 2012/03/22 20:47:45]

Curious. Sgtm...

+  else:
+    return exit_code < 0
+
+
+def DiagnoseExitCode(exit_code, command):
+  if IsCrashExitCode(exit_code):
+    sys.stderr.write('Command: %s\nCRASHED with exit code %d (0x%x)\n' % (
+        ' '.join(command), exit_code, exit_code & 0xffffffff))
+
+
 if __name__ == "__main__":
   import sys
   Main(sys.argv)